g-agrawal

🏪 Scalable E-Commerce Backend System

Capstone Project - Microservices Architecture

Spring Boot Java Distributed Systems Microservices Architecture Master's Capstone

📌 About This Project

This capstone initiative showcases a multi-service e-commerce backend system built on microservices principles, where critical business functions operate as autonomous, independently deployable units.

The primary goal is to illustrate production-grade distributed systems architecture and backend engineering practices, mirroring approaches adopted by large-scale enterprises like Amazon, Flipkart, and Shopify.

As opposed to traditional monolithic designs, this architecture prioritizes:

Independent service ownership
Autonomous horizontal scalability
Data and logic decentralization
Industry-standard architectural patterns

🏗️ Design Principles & Architecture Strategy

Decoupled Services Weak Inter-Service Dependencies Horizontal Scalability Message-Oriented Communication

Foundational Concepts

Every service maintains exclusive control of its database layer and operational logic
Services communicate through standardized HTTP REST endpoints
Architecture allows future migration to asynchronous, message-driven patterns
All components are engineered for independent scaling and failure recovery

Implementation strictly adheres to approved Product Requirements Document (PRD) and Architectural Specification (HLD) for this capstone.

🔌 Core Microservices & Component Overview

Every service listed represents a self-contained microservice module.
Collectively, they integrate to form a unified e-commerce platform.

🌐 Service Discovery Layer

🔗 Repository:
👉 https://github.com/g-agrawal/ServiceRegistry

Primary Functions

Automatic service location resolution
Service availability registration and lookup
Enables zero-downtime scaling and failover

💰 Payment Processing Service (In Development 🚧)

🔗 Repository:
👉 https://github.com/g-agrawal/PaymentService

Primary Functions

Encrypted transaction handling
Payment gateway integration abstraction
Payment outcome confirmation and retry logic

🎁 Product Catalog Service

🔗 Repository:
👉 https://github.com/g-agrawal/ProductService

Primary Functions

Search capability enablement
Inventory and category organization
Product metadata and information delivery

📢 Alert & Communication Service

🔗 Repository:
👉 https://github.com/g-agrawal/NotificationService

Primary Functions

User engagement and lifecycle messaging
Triggered notifications from platform events
Transaction and purchase receipts

🛍️ Shopping Cart Service

🔗 Repository:
👉 https://github.com/g-agrawal/Cartservice

Primary Functions

Performance-optimized for concurrent access patterns
Cart item addition and removal workflows
Persistent cart state storage per user

📋 Order Management Service

🔗 Repository:
👉 https://github.com/g-agrawal/OrderService

Primary Functions

Integration with payment and communication layers
Order placement and state progression
Detailed order history and monitoring

👤 User Service

🔗 Repository:
👉 https://github.com/g-agrawal/UserService

Primary Functions

User profile administration and account recovery
Authentication and user registration workflows
Secure session handling and credential management

🔄 End-to-End User Journey

➡️ User is authenticated through User Service

➡️ Discovers and explores products via Product Service

➡️ Manages shopping selections through Cart Service

➡️ Initiates purchase via Order Service

➡️ Order fulfillment activates multiple services

↳ Payment Service executes transaction

↳ Notification Service delivers updates

➡️ All services locate dependencies using Service Registry

The flow exemplifies an event-driven, loosely-coupled architecture consistent with HLD specifications.

🛠️ Technology Selection & Implementation Stack

Component	Technology Used
Programming Language	Java
Core Framework	Spring Boot (Spring Ecosystem)
Compilation & Packaging	Maven
API Protocol	REST with HTTP/HTTPS
Service Locator	Spring Cloud-based Registry
Data Persistence	SQL Databases (MySQL/PostgreSQL deployment-dependent)
In-Memory Storage	Redis or embedded caching solutions
Message Delivery	SMTP-compatible email services
System Architecture	Distributed Microservices
Containerization Path	Docker-compatible (suggested)

The chosen stack reflects production deployment scenarios found across implemented repositories.

� Learning & Technical Outcomes

This implementation demonstrates expertise in:

Decomposing business domains into independent microservices
Building fault-tolerant distributed backend systems
Strategic separation of responsibilities across services
Constructing resilient, growth-ready infrastructure
Industry-aligned system design and engineering decisions

The platform exhibits modularity, observability, and cloud deployment readiness.

📊 Future Development & Expansion Plans

Request Router / API Gateway Monitoring & Observability Container Orchestration Containerization System Hardening

Upcoming initiatives include:

Request routing and centralized gateway implementation
Unified telemetry and analytics infrastructure
Distributed transaction tracing (OpenTelemetry stack)
Payment service full implementation
Orchestrated containerization (Docker / Kubernetes deployment)
Access control and encryption hardening (JWT, credential storage)
System interaction diagrams and flowcharts

👨‍💼 Project Creator

Gourav (Modified Version)
📚 Master’s Capstone Initiative
🎯 Specialization: Microservices Design, Distributed Backend Architecture, System Engineering

🔗 Central Hub: https://g-agrawal.github.io/